Exception while displaying sf::Text - glcontext problem, probably with void GlContext::initResource()

I got problem with my code:

for (int i = 0; i < grs::arr_genres.size(); i++)
        {
            _genre_ID.setString(std::to_string(grs::arr_genres[i].genre_ID));
            _genre_ID.setPosition(windowSize1 - 1200, windowSize2 - 800 + fontsize + 10 * i);

            _gname.setString(grs::arr_genres[i].genre_name);
            _gname.setPosition(windowSize1 - 1200, windowSize2 - 800 + fontsize * 2 + 10 * i);

            window.draw(_genre_ID);
            window.draw(_gname);
        }

Without window.draw(...) everything works fine, even drawing text in every other place works good, like here:

text.setFont(font);
text.setFillColor(sf::Color::Black);
text.setPosition(x_center + 5, y_center + 10);
text.setStyle(sf::Text::Regular);
text.setCharacterSize(20);
text.setString(str);    
window.draw(text);

This is part of code where I'm making button. However, at that one exact place mentioned in first block of code I keep getting Exception thrown at 0x01307C04 in Sem3-2019-MatUr.exe: 0xC0000005: Access violation reading location 0x00000000. Also in this place I see glcontext.cpp not found I just downloaded it from SFML github page - and clicked Browse and find glcontext.cpp... and it showed that it is error connected with methodvoid GlContext::initResource() exactly line 319, resourceCount++;. Have anyone idea what is happening? Also I've noticed that this text is displayed in window only at first iteration of sf::RenderWindow loop. I tested puting static text like _gname.setString("static"), even without loop, and it still puts error. Any ideas how to solve that?